Sanyo HV-DX300A Service Manual page 23

TROUBLESHOOTING
E. No NORMAL AUDIO playback in record/playback mode(Check in REC mode)
No Normal Audio playback in
record/playback mode
Are there Audio signal at IC251
pin#4~7?
YES
Is there recording signal at
IC251 pin#21?
YES
Signal at IC251 pin#21 is transferred to
IC301 pin#13,15,17?
YES
REC (H) BASE voltage at Q206
is 5V?
YES
Collect signal at C222 is about
70Vp-p at 70KHz?
YES
Check P201 pin#2, 4, 8 and A/C
HEAD.
NO
Check input LINE JACK.
NO
Check IC251.
NO
Check signal flow circuit.
NO
Check IC501 pin#45.
NO
Check Q203.
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